/Engine/Plugins/Experimental/ChaosUserDataPT/Source/ChaosUserDataPT/Public/ChaosUserDataPT.h
Called once in a simulation step if any particles were unregistered. Occurs immediately before UniqueIdxs become invalid.
virtual void OnParticleUnregistered_Internal ( [TArray](API\Runtime\Core\Containers\TArray)< [TTuple](API\Runtime\Core\Misc\TTuple)< [FUniqueIdx](API\Runtime\Chaos\Chaos\FUniqueIdx), [FSingleParticlePhysicsProxy](API\Runtime\Chaos\PhysicsProxy\FSingleParticlePhysicsProxy) * >> & UnregisteredProxies )